Pontoon boat



FIG. 1 is a front perspective view of a pontoon boat showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view;

FIG. 4 is a side elevational view;

FIG. 5 is a bottom plan view; and,

FIG. 6 is a rear elevational view. 

The ornamental design for a pontoon boat, as shown and described. 